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Big Dog
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About Macktech689

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  1. I am having serious problems with my marck mp8 enjector Electronic unit it doesn't last 

  2. The frame mounted retarder is the best way to go, carrier mounted units caused a lot of problems. Visit telmausa.com and look under the technical support tab, lots of good information, that will give you a idea of what you are getting into.
  3. I have installed a couple dozen Telma systems and they are pretty straight forward. Is the Telma retarder you are looking at frame or carrier mounted?
  4. It's been the same for as long as I can remember. Big truck = Big buck.
  5. If you are looking for the overflow valve it's in the block above the front of the head on the air compressor.
  6. Your problem sounds nearly identical to a common rail I had a couple of weeks ago, cold start misfire. Installing a different solenoid valve to lower the rocker pressure fixed that one. Higher than normal pressure was unseating the brake pistons far enough to slightly open the exhaust valves and lower compression causing the misfire. Just food for thought, take it for what it's worth.
  7. What you are probably dealing with is high oil pressure in the rocker shaft causing low compression when the oil is cold, usually cause by running 15W40 instead of 10W30. Next time you check it cold install the gauge set on the front of the head. rocker pressure should be below 120 kPa, if the pressure goes to 150 kPa report results to tech support.
  8. Any time a ABS fault is repaired the module will turn off the light if the repair was successful. If you are replacing a wheel speed sensor the truck will have to be driven for the light to go out. If it stays on you didn't fix it.
  9. Not sure what you are using to read codes or the year model that has it. The only place I've seen a SIM card is in the telematics module.
  10. I totally agree but the reality is they sometimes get stuck during storage. I got burned by 1 in 2008 and have been checking them first since then. About half have been OK and the rest were stuck, only takes a minute to check the spool in the valve.
  11. New VCB control valves have done that for years, every time one is replaced the solenoid should be removed from the housing and checked to see if it is stuck, saves a lot of time. The valves work fine after they are freed up.
  12. When I first read this post I cringed, it's so easy to bend and break the valve train parts if you don't adjust that engine exactly right. Won't be the first time!
  13. The most likely cause of a MP-8 pushing coolant is the EGR cooler or injector sleeves. The first step is to perform a combustion leak test on the surge tank, if the test fluid turns green combustion gas is present in the cooling system. Check the cooler first by removing the hose and elbow and looking for coolant or chunks of soot in the cooler outlet. If your cooler looks OK you should get the sleeves replaced. I have never seen a head gasket failure on these engines. If the test fluid stays blue check your air drier for coolant.
  14. The TRLR AUX switch operates the center pin hot system. It is used to supply 12V to the trailer center pin only when the key is off. It is used by gasoline tanker trucks to operate the over fill protection devices on the trailer when loading. The switch will not power the center pin with the key on or parking brake released. When the key is on the center pin is powered all the time to operate trailer ABS systems.
  15. Replacing the actuator requires use of premium tech tool software. PTT has always had a operation to install and calibrate the actuator, if you put it on without doing it right the malfunction light will stay on and the turbo won't perform properly. You're dealer will have to do it, takes less than half an hour.
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